Crystal-field states of UO2 probed by directional dependence of nonresonant inelastic x-ray scattering

Nonresonant inelastic x-ray scattering (NIXS) has been performed on single crystals of UO2 to study the directional dependence of higher-order-multipole scattering from the uranium O4,5 edges (90-110 eV). By comparing the experimental results with theoretical calculations the symmetry of the ground...

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Main Authors: Sundermann, Martin (Author) , Haverkort, Maurits W. (Author)
Format: Article (Journal)
Language:English
Published: 5 November 2018
In: Physical review
Year: 2018, Volume: 98, Issue: 20
ISSN:2469-9969
DOI:10.1103/PhysRevB.98.205108
Online Access:Verlag, Volltext: https://doi.org/10.1103/PhysRevB.98.205108
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.98.205108
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Author Notes:M. Sundermann, G. van der Laan, A. Severing, L. Simonelli, G. H. Lander, M. W. Haverkort, and R. Caciuffo

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520 |a Nonresonant inelastic x-ray scattering (NIXS) has been performed on single crystals of UO2 to study the directional dependence of higher-order-multipole scattering from the uranium O4,5 edges (90-110 eV). By comparing the experimental results with theoretical calculations the symmetry of the ground state is confirmed directly as the crystal-field (CF) Γ5 triplet state within the J=4 manifold. The results demonstrate that the directional dichroism of the NIXS spectra is sensitive to the CF strength and establish NIXS as a tool for probing CF interactions quantitatively. 
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